The book, called "The Billy Bob Tapes: A Cave Full of Ghosts" will provide a "colorful tales of his modest Southern upbringing, his bizarre phobias, his life, his loves, and, of course, his movie career." Thornton wrote the book with musician/author Kinky Friedman.
Thornton and Jolie were married from 2000-03 and were known for their wild behavior. They even wore vials of each other's blood as necklace pendants. Jolie partnered up with Brad Pitt in 2005 and the couple now has six children together.
The book is set for release May 15, 2012.